•  3
    Type II Supernovae as Probes of Cosmology
    with D. Poznanski, E. Baron, S. Blondin, J. S. Bloom, C. B. D'Andrea, M. D. Valle, L. Dessart, R. S. Ellis, A. Gal-Yam, A. Goobar, M. Hamuy, M. Hicken, D. N. Kasen, K. L. Krisciunas, D. C. Leonard, W. Li, M. Livio, Marion H., T. Matheson, J. D. Neill, K. Nomoto, P. E. Nugent, R. Quimby, M. Sako, R. C. Thomas, M. Turatto, S. D. V. Dyk, and W. M. Wood-Vasey
    - Constraining the cosmological parameters and understanding Dark Energy have tremendous implications for the nature of the Universe and its physical laws. - The pervasive limit of systematic uncertainties reached by cosmography based on Cepheids and Type Ia supernovae warrants a search for complementary approaches. - Type II SNe have been shown to offer such a path. Their distances can be well constrained by luminosity-based or geometric methods. Competing, complementary, and concerted efforts …Read more
  • Spectral models for early time SN 2011fe observations
    with E. Baron, P. Hoeflich, B. Friesen, E. Hsiao, R. S. Ellis, A. Gal-Yam, P. E. da HowellNugent, I. Dominguez, K. Krisciunas, M. M. Phillips, N. Suntzeff, L. Wang, and R. C. Thomas
    © 2015 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society.We use observedUVthrough near-IR spectra to examine whether SN 2011fe can be understood in the framework of Branch-normal Type Ia supernovae and to examine its individual peculiarities. As a benchmark, we use a delayed-detonationmodel with a progenitormetallicity of Z⊙/20. We study the sensitivity of features to variations in progenitor metallicity, the outer density profile, and the distribution…Read more
  •  1
    Photometric selection of high-redshift type Ia supernova candidates
    with K. da HowellPerrett, P. E. Nugent, P. Astier, E. Aubourg, D. Balam, S. Basa, R. G. Carlberg, A. Conley, S. Fabbro, D. Fouchez, J. Guy, I. Hook, H. Lafoux, J. D. Neill, R. Pain, N. Palanque-Delabrouille, C. J. Pritchet, N. Regnault, J. Rich, R. Taillet, G. Aldering, S. Baumont, J. Bronder, M. Filiol, R. A. Knop, S. Perlmutter, and C. Tao
    We present a method for selecting high-redshift Type la supernovae located via rolling SN searches. The technique, using both color and magnitude information of events from only two to three epochs of multiband real-time photometry, is able to discriminate between SNe la and core-collapse SNe. Furthermore, for SNe la the method accurately predicts the redshift, phase, and light-curve parameterization of these events based only on pre-maximum-light data. We demonstrate the effectiveness of the te…Read more
  •  12
    Earned Citizenship
    Oxford University Press. 2019.
    The migration and settlement of 11 million unauthorized immigrants is among the leading political challenges facing the United States today. The majority of unauthorized immigrants in the U.S. have been here for more than five years, and are settling into American communities, working, forming families, and serving in the military, even though they may be detained and deported if they are discovered. An open question remains as to what to do about unauthorized immigrants who are already living i…Read more